SU695546A3 - Electric antiicing device - Google Patents

Description

The invention relates to the field of electric anti-icing systems of aircraft, in particular for helicopter rotor blades, and can also be used in electric anti-icing systems of other objects. The known electric de-icing system of the aircraft, containing electric heaters, which are connected to the onboard supply network by means of electrical contact switching elements. 2. The closest to the invention is a technical solution - electric anti-icer A device containing a three-phase collector and three-circuit switching elements, through which electric heaters, grouped by t, each heating element in each, are connected to a three-phase supply network, and the control inputs of the switching elements are connected to the output of the program switch 3. Lack of such devices lies in the fact that in the circuit of the power supply circuits of the heating elements a significant current flows through the switching elements (the total current of the heating element group in). This leads to the need to use powerful and therefore large in size and weight switching elements. The purpose of the invention is to reduce the switching power and, accordingly, reduce the size and weight of the switching elements. The goal is achieved by the fact that each of the power supply circuits of the heating elements of the corresponding group is split into two, and in two phases one of the split circuits is connected to the heating elements bypassing the switching element, and in the third phase each split circuit is connected to the heating element the switching circuit, i.e., the current through the switching element is halved. This solution is ensured by the fact that each of the heater groups is connected to a three-phase network.

they are connected to one of the ends of the corresponding heating element, the inputs are connected to two power supply phases, the first phase of which is simultaneously connected to two inputs, the second to the third input and at the same time to the second end of the heating element, the switching element connected through its circuit to the first phase, and the second ends of the group's o-steel aggregation elements are connected directly to the third phase.

On fng. 1 shows a block diagram of the device; in fig. 2 shows the placement of the heating elements on the blade x; in fig. 3 is a diagram of the electrical connection of the switching and heating elements; in fig. 4-7 schemes of 1-4 groups of heaters; in fig. 8-diagram of the cycle of the device.

The electric de-icing device for helicopter blades of the helicopter consists of “3 collectors, program switch 2, switching elements 3 in the form of three-phase contactors and heating elements 4. The power of the three-phase system is brought to the device by three pairs of ring-brush of three-phase collector 1.

On separate blades x 5, 6, 7, and 8 of the helicopter's screw, sections I, II, III “IV heating elements are marked. .Section sections of the elements that work simultaneously, are marked with the same

hatching (.fig.; 2)

For each three-phase contactor (Fig. 3), only two phases of the supply voltage are connected to the inputs. One of these phases is directly connected to the common point of the four heating sections bypassing the contacts of the contactor. And the second is simultaneously connected to the third free input clamp of the contact. Power, bones of heating elements odd sections of blades (I, P1 ...) are equal to half: the polish of heating elements of even sections (II, IV ...).

As can be seen from the diagram shown in FIG. 3, for two consecutive work cycles

The devices and the supply voltage of the excitation alternately to the right and left contactors in accordance with the signal diagram shown in FIG. 8, the heating elements will be connected to the triangles of the load, respectively (f. 4, 4 for the first cycle. Work and Fig. 5, for the second cycle). Subsequent cycles of operation are similar to those described.

Formula and 3 optics

Electric pro-icing device, for example, for blades

helicopter rotors, containing a three-phase collector and three-stop switching elements, through which electrical heaters, grouped in groups of three heating elements each, are connected to a three-phase power network, and the control inputs of the switching elements are connected to the output of the software switch, distinguished by the fact that, in order to reduce the switching power and, accordingly, reduce the size and weight of the switching elements, each of the groups of heaters is connected to a three-phase power supply network cut its switching element, and its outputs are connected to one of the ends of the corresponding heating element, the inputs are connected to two phase | M of the power supply network, 1 of which the first phase is simultaneously connected to two inputs, the second to

to the third input and at the same time to the second KOHiuy of the heating element connected through its own circuit of the switching element to the first phase, and the second ends of the remaining heating elements of the group are connected directly to the third phase.

Sources of information taken into account in the examination:

1. Patent of Great Britain No. 1087564, cl. In 7 W, pub. 18. 10. 67.

2. The patent of Germany No. 1272737, cl. 62 B 49, published. and. 07. 68.

3. The patent of the USSR No. 454729, cl. B 64 D 15/12, 06.12.67.

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